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Here I have made all the number cells include the number 3. This puzzle proved hard to design
as I wanted to be sure that every cell had a clue to make it black or white.

The puzzle will congratulate you when you get all the black squares correct and, as before, the
answer is given further down the page for if you really do give up.

There is a third puzzle which I tried to make harder and again every square is accounted for. Here it is.

There is a third puzzle which I tried to make harder and again every square is accounted for. Here it is.